Clark School Home UMD

ISR News Story

Vorontsov, Krishnaprasad, Justh and Beresnev receive sensor patent

Schematic drawing of the sensor
Schematic drawing of the sensor

Research Professor Mikhail Vorontsov (ISR), ISR Assistant Research Scientist Eric Justh, Dr. Leonid I. Beresnev (Army Research Laboratory), Professor P.S. Krishnaprasad (ECE/ISR); and Dr. Jennifer Ricklin (Army Research Laboratory) have been awarded U.S. Patent 6,911,637 for "Wavefront phase sensors using optically or electrically controlled phase spatial light modulators."

These systems and methods for optical wavefront sensing and control are based on a phase-contrast Fourier-domain filtering technique. Wavefront phase sensing is accomplished using an optically or electronically controlled phase spatial light modulator (SLM) as a Fourier-domain filter. Examples of optically controlled phase SLMs include (1) liquid crystal light valve (LCLV); (2) micro-electromechanical system (MEMS) micromirror array used in conjunction with a photodetector array; and (3) pixelized liquid-crystal device used in conjunction with a photodetector array.

The direct adaptive optic feedback system approach is capable of high-resolution real-time correction of atmospheric turbulence-induced wavefront phase aberrations. The disclosed wavefront sensors could be used with conventional low-resolution adaptive-optic wavefront correction hardware based on deformable mirrors or multi-electrode wavefront phase modulators.

The invention also includes a wavefront sensor, the "Differential Zernike Filter." This device uses the difference between two intensity measurements corresponding to equal but oppositely-directed zero-order spectral component phase shifts to produce a high visibility wavefront sensor output that is particularly well-suited for use in the direct adaptive optic feedback system. | ISR patents page |

July 16, 2005


Prev   Next

 

 

Current Headlines

Regli is co-PI for ARM functional interoperable compiler project

Shoukry Wins NSF CAREER Award

Pines Elected to National Academy of Engineering

UMD Fire Researchers Ignite the First of Two Space Station Experiments

Scientists Develop First Fabric to Automatically Cool or Insulate Depending on Conditions

125 Years of Daring Vision, Lasting Impact

UMD researchers awarded $5.3M NIH BRAIN Initiative grant

Nanostructure of carbon and metal could solve potassium-battery puzzle

Students advance in Qualcomm Innovation Fellowship competition

UMD auditory cortex research featured in Nature Neuroscience

News Resources

Return to Newsroom

Search News

Archived News

Events Resources

Events Calendar